Universal neutralizer for perm Universal neutralizer for waving. Essential as a closure for the waving service with the Waving Liquid. Formulation enriched with herbal extracts for protective action on hair. Usage: After the tempo application time of the Waving Liquid, rinse thoroughly and carefully apply the Neutralizer using una sponge. Tempo of application time equal to or greater than the tempo application time of the Waving Liquid Remove the curlers and, if necessary, reapply the neutralizer, leaving it on for another 5 minutes. Rinse carefully.